Pneumatic rock-drill.



C. J. SMITH.

PNEUMATIG ROCK DRILL.

APPLIOATIONTILED APH. v. 191s.

Patented Feb. 10, 1914.

New

2 SHEETS-*SHEET l.

, y l /w/ CLARK J. SMITH, OF OTTUMWA, IOWA.

PNEUMATIC ROCK-DRILL.

Speccation of Letters Patent.

Patented Feb. 10, 1914.

Application filed April 7, 1913. Serial No. 759,538.

To all whom it may concern Be it known that l, CLARK J. SMITH, residingat Ottumwa, in the county of lli/'apelle and State of Iowa, haveinvented certain new and useful Improvements in Pneumatic Rock-Drills,of which the following is a specification.

rlhis invention, which relates to improvements in rock drills, is moreespecially in the nature of a pneumatically actuated rotating attachmentfor pneumatic drills of the hammer type and more especially adapt.- edfor drilling coal rock and any hard mining substance.

In pneumatic rock drilling machines now in general use, where areciprocating hammer piston, by rapidly successive blows, drives thedrill bit farther into the substance being drilled, constant turning ofthe drill is necessary sothat the cutting or penetrating portions on theend of the drill do not strike on the same indentations, which usuallycauses either a poor lcutting or drilling or none at all.

My invention primarily seeks to provide certain improvements in rockdrills of the general type stated of a simple and practical constructionand in which the parts are coperatively arranged and especially designedfor obviating the usual eXtra attention of turning the bit by hand andwith that and other objects in view my `invention consists of thepeculiar combination and novel arrangement of the parts, hereinafterfully described, specifically pointed out in the appended claims andillustrated in the accompanying drawings, in which:

Figure 1 is a longitudinal section, partly in elevation, of a pneumaticrock drill hammer showing my appliance attached thereto. Fig. 2 is anenlarged section on line 2 2 on Fig. 1. Fig. 3 is a view similar to Fig.2, showing the parts in a different position. Fig. i is a section online 4-1l on Fig. 3. Fig. 5 is a perspective view partly in section ofthe reciprocating air valve. Fig. 6 is a perspective of the pawlcarrying and actuating block piston.

ln the practical .application of my present invention my improvedattachments are adapted for being mounted upon and combined with a handmachine in which is included a pneumatically actuated driving member orhammer, such a general type of machine being shown in the .accompanyingdrawings in which a designates the handle that carries the casing b, inwhich is located a pneumatic hammer or plunger c of any approved type,the front endof the said casing having the usual passage (Z for the buttend of the drill e.

Referring now more particularly to my improved attachments, the sameincludes a main frame l, that is attached to and is mounted on the frontend of the casing o and disposed transversely thereof whereby to bring aforwardly extended aperturcd hub portion l5, of the said frame, inlongitudinal alinement with the drill shank passage al in the casing 7).The framing l also includes a cylinder 1G, the opposite ends of whichare formed with axial sockets 17-17 for receiving the opposite en ds ofa shiftable valve 3 on which is loosely mounted al piston 2, providedwith a central annular groove 20, for receiving the projecting lug G0 ofthe shiftable or ratchet block 6, present-ly again referred to.

17a designates a main inlet for the working fluid, and the same islocated centrally over the working cylinder and it communicates with theopposite ends of the said cylinder through the fluid passages 18.

Valve 3, before referred to, is in the nature of a central shaft for thepiston, its opposite ends projecting into the sockets at the oppositeends of the working cylinder and each of the said ends has an inlet30-30 that connects through the ports or channels 3l with the exhaustports 4 4 in the opposite ends of the cylinder.

Valve 3 at each end has an annular fluid passage 33 and each of thepassages 33 connects with a longitudinal. fluid passage Sil- 34s, thatextends over nearly to the other end of the valve and the end of each ofthe passages 34 terminates in a radial outlet 35 that opens into theworking cylinder or chamber, as is best shown in Fig. 2 of the drawing,by reference to which it will be also seen each end of the valve hasanother annular groove 36-36 that forms passages for the fluid passingfrom the main inlet to and through the lateral fluid passages to theworking cylinder under the proper adjustments of the valve.

By reason of the peculiar' construction and arrangement of the partsconstituting the working cylinder and piston, it will be readilyapparent by referring to Figs. l, 2 and 3, that when the piston hastraveled to the position shown in Fig. a', valve port 4t opens whichallows the fluid to pass to the right hand end of the valve 3, (see Fig.2) to force the said valve 3 back to the position shown in the said Fig.2, thereby bringing the fluid passage from the main inlet into opencommunication with the working cylinder at the right hand end of thepiston and the other end of the cylinder into open communication withthe exhaust 5.

Both ends of the cylinder and the valve are alike and hence after theaction just explained has taken place under the movements of the pistonin one direction, a like action takes place at the other end by reasonof the movement of the piston in the other direction.

Since the piston and the valve travel the same way, it is evident thatshould there be any friction on the piston or the valve, it will assistin holding the valve open to its work.

For turning the drill, I prefer to use the ratchet mechanism shown andthe same inchicles a ratchet sleeve or bushing S that turns in the hubof the main framing and in which the drill shank is slidably held.

The ratchet block 6 before referred to is reciprocably held in a socket6l in the framing and it carries a drop-pawl 10 that en gages theratchet at one side, a second pawl l2 being also provided for engagingthe ratchet at the same side, the latter pawl being pivotally mounted ona rocker lever 9 normally moved by a spring 13 to pull the pawl 12 backfrom the ratchet 8. One end of the lever 9 is projected in the path ofmovement of the ratchet block 6 and is so disposed that as the saidblock is carried forwardly with the piston Q (see arrow the said blockengages the lever 9 and thereby throws the pawl 12 to turn the ratchetwith the drill in the direction indicated by the arrow y, it beingobvious from the drawing, that as the block 6 is moved in the otherdirection its pawl 10 engages and moves the ratchet 8 in the samedirection, the reciprocable movement of the block 6 under thereciprocating actions of the piston imparts a continuous rotary travelto the drill.

To provide for a simple and expedient assembling of the valve and thepiston, one end of the piston cylinder casing is plugged as at 40, andthe plug held by a cross pin 41.

lVhile for convenience of illustration I have disclosed a completeembodiment of my invention, yet in this application I make no claim tothe specific construction of fluid pressure motor, per se, as that formsthe subject matter of a divisional application filed May 29, 1913,Serial No. 770,586.

From the foregoing taken in connection with the drawings, the completeconstruction, the manner of operation and the advantages of my inventionwill be readily understood by those skilled in the art to which itappertains.

What I claim is:

l. A chuck holder, a chuck rotatively mounted thereon, a rectilineallyreciprocating block, connections between the said block and chuck forimparting rotation to the said chuck as the block is reciprocated, and aiiuid operated engine including a 1e ciprocating piston connected withthe said block for reciprocating the same.

2. In combination with a chuck holder, and a chuck rotatably mounted insaid holder, said chuck having a ratchet portion, of a reciprocatingblock mounted in said holder, a pawl carried by said block for engagingsaid ratchet portion, and a second pawl device mounted in said holderfor engaging said ratchet portion, and including a member adapted to beengaged by said block when reciprocated to turn said chuck.

3. A chuck holder, a chuck rotatably mounted therein, said chuckincluding a ratchet portion, a block reciprocably mounted in said chuckholder, a pivoted dog in said chuck holder, and a pawl carried by saiddog for engaging said ratchet portion, said dog having a portionprojecting into the path of movement of said block, whereby, as saidblock is moved in one direction said dog is moved to turn said ratchet,and means for reciprocating said block. Y

t. A chuck holder, a chuck rotatably mounted therein, said chuckincluding a ratchet portion, a block reciprocably mounted in said chuckholder, a pivoted dog in said chuck holder, and a pawl carried by vsaiddog for engaging said ratchet portion, said dog having a portionprojecting into the path of movement of said block, whereby, as saidblock is moved in one direction said dog is moved to turn said ratchet,and means for reciprocating said block, a pawl carried by said block forengaging said ratchet to turn said ratchet as said block is moved in adirection opposite to that in which said dog is operated. Y

5. A chuck holder, a Vchuck rotatively mounted thereon including anannular ratchet member, a reciprocating block, connections between thesaid block and the chuck as the block is reciprocated, said connectonsincluding a pawl carried by the ing piston connected with the said blockfor block for engaging the ratchet member as reciprocating the same.`the block moves in one direction, a rocker pawl for engaging the saidratchet member CLARK J SMITH' .5 that is actuated by the said block asthe Vitnesses:

block moves in the opposite direction, and a FRANK MGINTIRE,

uid operated engine including a, reciprocat- H. T. POLLARD.

Gopiel of this patent may be obtained for ve cents each, 'by addressingthe Commissioner of latenti, Washington, D. C.

